Improvement in reversible rotary cutters



Patented May 27, `1873;`

l r r y E. v.,nNE|LL.

Reversible Rotary Cutters;

4 AM PHT'iTHOGRPH/L CQ MY (OSBDRNEPRUUES.)

Mmmm am UNITED STATES PATENT OFFICE.

EDWARD ONEILL, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR T0 HIMSELF, JAMESKELLY, AND ROBERT PILKINGTON, OF SAME PLACE.

IMPROVEMENT IN REVERSIBLE ROTARY CUTTERS.

S pecilication forming part of Letters PatentNo. 139,4l7, dated May 27,1873; application iiled February 27, 1873.

To all whom it may concern:

Be it known that I, EDWARD V. ONEILL, of Philadelphia, Pennsylvania,have invented an Improvement in Reversible Rotary Cutters, of which thefollowing is a speciiication:

My invention relates to that class of rotary cutting-tools which areprovided with two sets of radiating blades; one set to cut when the toolis rotated in one direction, and the other when it is lrotated in theopposite direction and the object of my invention is to prevent thegrinding away and dulling of the cuttingedges of the reversed set ofcutters by contact with the marble or other material, or the chipping ofthe latter by the same, while the cutters of the other set are inoperation.

I accomplish this object in the manne-r plainly shown in the plan view,Figure l of the accompanying drawing, by rendering the blades A and A ofthe two sets adjustable toward and from the center of the tool, so thatthe reversed set may be drawn in, and the operatin g set projectedoutward, the simultaneous adjustment ofthe Whole number of blades ofboth sets being eii'ected by a partial rotation in one direction or theother, of a hub, B, provided with alternate recesses and projections aand b adapted to the inner ends of the blades. The blades are'in thepresentinstance arranged in pairs, back to back, as plainly shown inFig. l, with their cutting edges beveled in opposite directions, theblades A being arranged to cut when the tool is rotated in the directionof the arrow, and the bladeslA when it is reversed or rotated in theopposite direction. Each pair of blades is adapted to and arranged toslide in a single radial recess, d, formed in the stock F of the tool,the said blades being retained in these recesses by the anges e and e ofthe two plates G and H, which overlap the projections f and f at theopposite ends ofthe blades, as plainly shown in the sectional view, Fig.2. The rotating hub B is conical in the present instance, and is adaptedto a correspondinglyshaped recess inthe stock F, in which it can beturned to la limited extent by means of a thumb-screw, h, extendingthrough a slot, i,

in the plate Gr, the said thumbscrew also serving as a means of seemingthe hub after adjustment. When the parts are in the position shown inFig. 1 the extended blades A, which have a solid end bearing against theprojections b of the hub, operate upon the marble stone or othermaterial to be cut, when the tool is rotated in the direction of the arrow, while the inner ends of the reversed blades A are received withinthe recesses a of the hub, and are thus retracted suiiciently to preventtheir y cutting. edges from being brought in contact with the marble,the dulling of the said blades, or the chipping of the marble by thesame beingJ thus prevented. When the cutter is to be operated in areverse direction, the hub B is turned to the limited extent necessaryto force the blades A outwardly, and to bring the recesses a of the saidhub opposite the inner ends of the blades A so that the latter mayberetracted sufficiently to protect their cutting-edges.

I prefer to arrange the blades in pairs, as`

shown in the drawing; but eachblade may, if desired, be adapted to aseparate recess in the stock F. In such case, however, unless the bladeswere very close together there would have to be a separate recess andprojection a and b, in the adjustable hub for each blade.

I claim as my invention:

1. A reversible rotary cutter in which two sets of blades are larrangedradially, and are combined with operating devices as described, so thatone set of blades is retracted when the other is extended, as set forth.

2. In a rotary cutter, the combination, substantially as described, oftwo sets of adjustable blades, A and A', with an adjustable hub, B,formed with recesses and projections a andr b adapted to the inner endsof the said blades.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing Witnesses.

EDWARD V. ONEILL. Witnesses:

EDWARD R. WOREELL, DANIEL W. GILBERT.

